Method of etching on glass and other material



(Specimens) METHOD OF ETGHING 0N GLASS AND OTHER MATERIAL. No. 343,961.Patented June 15, 1886.

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JOSEPH LOCKE, OF MEDFORD, ASSIGNOR TO EDWARD D. LIBBEY, OF WINCHESTER,MASSACHUSETTS.

METHOD OF ETCHING ON GLASS AND OTHER MATERIAL.

SPECIFICATION forming part of Letters Patent No. 343,961, dated June 15,1886.

Application filed January 18,1886. Serial No. 188,917. (Specimens) Toall whom it may concern.-

Be it known that I, 'JQSEPH LOOKE, a subject of the Queen of GreatBritain, but at present residing in Medford, county of MiddleseX, andSlate of Massachusetts, have invented an Improvement in Methods ofEtching on Glass and other Material, of which the following is aspecification.

This invention has for its object to improve the method of etching onglass, metal, and

other substance which can be eaten by acid.

In methods of etching now practised to produce what is known as astipple effect, the wax or acid resisting pellicle or layer applied tothe glass is cut through by means of a tool at points where the materialis to be eaten or attacked by the acid when the material is placed inthe usual acid-bath.

In my experiments, to simplify and hasten the operation of etching toproduce a stippled or frosted ground, and at the same time cheapen thecost of that kind of work, I have discovered that the usual pellicle orlayer of wax is unnecessary; and also that it is unnecessary to cut oroutline by a tool the spots where the acid may attack the material forthe production of the stippled ground.

The drawing represents a vase, a part of which has been treated torepresent stipple- Work.

The article to be treated, whether it be a piece of ware or a plate orsheet, will, in accordance with my invention, be protected at pointswhere the article is to be left smooth and plain, as shown at A A, bymeans of a pellicle or layer of wax or other usual acidresistingcoating. The part of the article which is to be etched to resemblestipplework, as at b, has applied to it a thin layer of some finelycomminuted or pulverized acidresisting powdersuch, for instance, asrosin, asphaltum, or other well-known equivalent havinglike properties.The fine particles of the acid-resisting powder applied in a thincoating, as described, will be made to adhere to the ware, plate, orsheet, preferably by means of a thin layer of oil, varnish, or otherequivalent compound, the said particles adhering to and touching thebody of the article, protecting the said article at such points from theacid in the usual acid-bath; but all parts of the article not soprotected by the said particles, or parts of the article coated onlywith the oil or varnish, are left free to be acted upon by the acid, andsaid non-protected portions acted upon by the acid are attacked andeaten away but all parts of the article protected by an adheringparticle of rosin or other acid-resisting powder is not eaten by theacid.

The article herein represented-a vase-is supposed to have been actedupon by the acid, as described, to form the stipple-work b.

The finer the acid-resisting powder or material, the finer thestipple-work.

The acid-resisting or protecting particles may be deposited on the glassor other plate or body by means of a sieve or by sprinkling.

I claim The herein-described improvement in the art or method of etchingglass and other material to produce a stipple ground, which consists indepositing upon the said material separate detached particles ofacid-resisting powder, and then subjecting the article so treated to theaction of acid, whereby the portions of the surface of the article notprotected by the acid-resisting particles are attacked and eaten away bythe acid, substantially as described.

' In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

JOSEPH LOGKE.

Witnesses:

G. W. GREGORY, F. L. EMERY.

